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多項選擇題Which two multicast protocol statements are true?（）

A. Sparse mode multicast uses a pull model to send multicast traffic to where it is requested
B. Dense mode multicast uses a push model to flood traffic throughout the network and then prunes the unwanted traffic
C. Dense mode multicast requires explicit join messa ges from their members
D. Sparse mode uses reverse path forwarding (RPF) to prune off redundant flows
E. The primary use of sparse mode multicast is for test labs and router performance testing

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1.多項選擇題Which two statements are tru e about the rendezvous point (RP) in a multicast network?（）

A. The multicast sources must register with the RP to form the multicast distribution tree
B. An RP is required only in networks running Protocol Independent Multicast dense mode ( PIM DM)
C. The multicast receivers must register with the RP to form the multicast distribution tree
D. An RP is required only in networks running Protocol Independent Multicast sparse mode (PIM SM)
E. An RP is required only in networks running Pro tocol Independent Multicast sparse - dense mode (PIM - SDM)
F. To form the multicast distribution tree, the multicast sources register with and the receivers join the RP

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2.單項選擇題 Refer to the exhibit. All routers have Protocol Independent Multicast (PIM) enabled interfaces. On the basis of the configuration provided on routers R1 and R2, which router will take on the func tion of rendezvous point (RP) for the multicast network? （）

A. both routers R1 and R2
B. router R1
C. router R2
D. none of the routers since they are not configured with static RP

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3.單項選擇題 Refer to the network of Layer 3 switches in the exhibit. The RPI Multi cast Server only multicasts to hosts connected to multilayer switches 5 and 6. The CMU Multicast Server multicasts to hosts on multilayer switches 1 - 6. Given the number of configuration steps involved, what is the most efficient way to configure the net work while meeting the requirements for multicast data flow? （）

A. Configure each switch with PIM sparse mode and a separate instance of PIM dense mode.Specify switch 1 as the root for the RPI Multicast Server. Specify switch 2 as the root for the CMU Multicast Server.
B. Configure each switch with PIM sparse mode and a separate instance of PIM dense mode. Leave each multicast server as the root of its own multicast tree.
C. Configure each switch with PIM sparse - dense mode. Configure switch 3 as a ren dezvous point for the RPI multicast stream.
D. Configure each switch with PIM sparse mode and a separate instance of PIM dense mode.Allow the switches to elect their own root for each multicast tree.
E. Configure each switch with PIM sparse mode.
F. Configure each switch with PIM dense mode.

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4.單項選擇題 Refer to the exhibit. All multilayer switches are running PIM dense mode. Recipient A and Recipient B are sending IGMPv2 joi n messages to their respective multilayer switches. Which statement is true?（）

A. The Multicast Server is the root of the multicast tree. Switches 1, 3, 4, and 5 will participate in the multicast tree once pruning has taken place.
B. The Multicast Serv er is the root of the multicast tree. Switches 4 and 5 will participate in the multicast tree once pruning has taken place.
C. Switch 3 is the root of the multicast tree. Switches 3,4, and 5 will participate in the multicast tree once pruning has taken place.
D. Switch 3 is the root of the multicast tree. Switches 1,3,4, and 5 will participate in the multicast tree once pruning has taken place.
E. Switch 1 is the root of the multicast tree. Switches 1,4, and 5 will participate in the multicast tree once pruning has taken place.
F. Switch 1 is the root of the multicast tree. Switches 1,3,4, and 5 will participate in the multicast tree once pruning has taken place.

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5.多項選擇題Which three statements are true about IP multicast configuration?（）

A. PIM sparse - dense mode and PIM dense mode require an RP on the network.
B. PIM sparse mode and PIM dense mode require an RP on the network.
C. PIM sparse mode interfaces are always added to the multicast routing table in a router.
D. PIM sparse mode and PIM sparse - dense mode require an RP on the network.
E. PIM dense mode interfaces are always added to the multicast routing table in a router.
F. PIM sparse - dense mode acts as PIM dense mode if an RP is not known.

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